A simple implementation for logging library.
const logger = new Logger();
logger.trace('Trace message');
logger.debug('Debug message');
logger.info('Info message');
logger.warn('Warn message');
logger.error('Error message');
logger.info('Log the object', {
foo: 'baz'
});-
Appenders serialise log events to some form of output. They can write to files, outputs to console.
-
The library provides 2 log appenders:
-
Console Appender : This appender outputs log messages to the console.
-
File Appender : This appedner outputs log message to a file (as requirement).
-
-
name (string): The name of the logger.
-
timestamps (Boolean): Whether to include timestamps in logs (default: true)
-
appenders: Array of appenders to process and log the data. (default: [ConsoleAppender])
// Initialize the console logger
const consoleAppender = new ConsoleAppender();
/*
- The file appender will create 'logs/app.log' if it doesn't exist.
- If 'logs/app.log' exists, it will append new logs to the file.
- Log rotation options can be provided to the file appender to automatically
rotate the log file based on date.
*/
const fileAppender = new FileAppender({ path: 'logs/app.log' });
// Set up the logger with both console and file appenders
const logger = new Logger({
appenders: [consoleAppender, fileAppender]
});
/*
The logger will use both appenders:
- The console appender outputs log messages to the console.
- The file appender writes log messages to 'logs/app.log'.
*/
logger.info('Information log message');Can add multiple appenders to a single logger, so that log messages can be sent to multiple outputs.
You can also create custom log appenders by extending the Appender class as shown below:
export class CustomAppender extends Appender {
constructor() {
super();
}
handle(config: AppenderConfig) {
console.log([`[CustomAppender] - ${config.message}`]);
}
}Note: You can also create custom log formatters by implementing the
Formatterinterface.
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